linux-kernel - [tip:perf/core] tools lib fs debugfs: Check if debugfs is mounted when handling ENOENT

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Date:	Wed, 28 Jan 2015 07:10:00 -0800
From:	tip-bot for Arnaldo Carvalho de Melo <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	acme@...hat.com, jolsa@...hat.com, bp@...e.de,
	adrian.hunter@...el.com, tglx@...utronix.de,
	linux-kernel@...r.kernel.org, eranian@...gle.com,
	dsahern@...il.com, mingo@...nel.org, hpa@...or.com,
	namhyung@...nel.org, dzickus@...hat.com, fweisbec@...il.com
Subject: [tip:perf/core] tools lib fs debugfs:
  Check if debugfs is mounted when handling ENOENT

Commit-ID:  f816b3cc99804a9f771315331deb36abec47f5b4
Gitweb:     http://git.kernel.org/tip/f816b3cc99804a9f771315331deb36abec47f5b4
Author:     Arnaldo Carvalho de Melo <acme@...hat.com>
AuthorDate: Thu, 22 Jan 2015 16:35:42 -0300
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Thu, 22 Jan 2015 17:02:23 -0300

tools lib fs debugfs: Check if debugfs is mounted when handling ENOENT

If debugfs was already mounted, then its a matter of not finding the
tracepoint, tell the user that perhaps a CONFIG_ setting is not enabled.

Cc: Adrian Hunter <adrian.hunter@...el.com>
Cc: Borislav Petkov <bp@...e.de>
Cc: David Ahern <dsahern@...il.com>
Cc: Don Zickus <dzickus@...hat.com>
Cc: Frederic Weisbecker <fweisbec@...il.com>
Cc: Jiri Olsa <jolsa@...hat.com>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Stephane Eranian <eranian@...gle.com>
Link: http://lkml.kernel.org/n/tip-6chfytoflyx3jwfqm7ebltu0@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/lib/api/fs/debugfs.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/tools/lib/api/fs/debugfs.c b/tools/lib/api/fs/debugfs.c
index bf9e216..d2b18e8 100644
--- a/tools/lib/api/fs/debugfs.c
+++ b/tools/lib/api/fs/debugfs.c
@@ -106,6 +106,13 @@ int debugfs__strerror_open(int err, char *buf, size_t size, const char *filename
 
 	switch (err) {
 	case ENOENT:
+		if (debugfs_found) {
+			snprintf(buf, size,
+				 "Error:\tFile %s/%s not found.\n"
+				 "Hint:\tPerhaps this kernel misses some CONFIG_ setting to enable this feature?.\n",
+				 debugfs_mountpoint, filename);
+			break;
+		}
 		snprintf(buf, size, "%s",
 			 "Error:\tUnable to find debugfs\n"
 			 "Hint:\tWas your kernel compiled with debugfs support?\n"
--
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